Bobbin



FIG. 1 is a perspective view of a bobbin showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and

FIG. 8 is a cross-sectional view taken along the line A-A of FIG. 6;

FIG. 9 is the second perspective view showing the bobbin; and,

FIG. 10 is a third perspective view shown in environmental use.

The broken lines in the figures illustrate the portions of the design that form no part of the claimed design. 

CLAIM The ornamental design for a bobbin, as shown and described. 